main.c revision 262643 
1/*-
2 * Copyright (c) 1980, 1992, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31
32__FBSDID("$FreeBSD: stable/10/usr.bin/systat/main.c 262643 2014-03-01 03:09:16Z brooks $");
33
34#ifdef lint
35static const char sccsid[] = "@(#)main.c	8.1 (Berkeley) 6/6/93";
36#endif
37
38#ifndef lint
39static const char copyright[] =
40"@(#) Copyright (c) 1980, 1992, 1993\n\
41	The Regents of the University of California.  All rights reserved.\n";
42#endif
43
44#include <sys/param.h>
45#include <sys/time.h>
46#include <sys/sysctl.h>
47
48#include <err.h>
49#include <limits.h>
50#include <locale.h>
51#include <nlist.h>
52#include <paths.h>
53#include <signal.h>
54#include <stdio.h>
55#include <stdlib.h>
56#include <unistd.h>
57
58#include "systat.h"
59#include "extern.h"
60
61static int     dellave;
62
63kvm_t *kd;
64sig_t	sigtstpdfl;
65double avenrun[3];
66int     col;
67unsigned int	delay = 5000000;	/* in microseconds */
68int     verbose = 1;                    /* to report kvm read errs */
69struct	clockinfo clkinfo;
70double	hertz;
71char    c;
72char    *namp;
73char    hostname[MAXHOSTNAMELEN];
74WINDOW  *wnd;
75int     CMDLINE;
76int     use_kvm = 1;
77
78static	WINDOW *wload;			/* one line window for load average */
79
80int
81main(int argc, char **argv)
82{
83	char errbuf[_POSIX2_LINE_MAX], dummy;
84	size_t	size;
85	double t;
86
87#ifdef USE_WIDECHAR
88	(void) setlocale(LC_ALL, "");
89#else
90	(void) setlocale(LC_TIME, "");
91#endif
92
93	argc--, argv++;
94	while (argc > 0) {
95		if (argv[0][0] == '-') {
96			struct cmdtab *p;
97
98			p = lookup(&argv[0][1]);
99			if (p == (struct cmdtab *)-1)
100				errx(1, "%s: ambiguous request", &argv[0][1]);
101			if (p == (struct cmdtab *)0)
102				errx(1, "%s: unknown request", &argv[0][1]);
103			curcmd = p;
104		} else {
105			t = strtod(argv[0], NULL) * 1000000.0;
106			if (t > 0 && t < (double)UINT_MAX)
107				delay = (unsigned int)t;
108		}
109		argc--, argv++;
110	}
111	kd = kvm_openfiles(NULL, NULL, NULL, O_RDONLY, errbuf);
112	if (kd != NULL) {
113		/*
114		 * Try to actually read something, we may be in a jail, and
115		 * have /dev/null opened as /dev/mem.
116		 */
117		if (kvm_nlist(kd, namelist) != 0 || namelist[0].n_value == 0 ||
118		    kvm_read(kd, namelist[0].n_value, &dummy, sizeof(dummy)) !=
119		    sizeof(dummy)) {
120			kvm_close(kd);
121			kd = NULL;
122		}
123	}
124	if (kd == NULL) {
125		/*
126		 * Maybe we are lacking permissions? Retry, this time with bogus
127		 * devices. We can now use sysctl only.
128		 */
129		use_kvm = 0;
130		kd = kvm_openfiles("/dev/null", "/dev/null", "/dev/null",
131		    O_RDONLY, errbuf);
132		if (kd == NULL) {
133			error("%s", errbuf);
134			exit(1);
135		}
136	}
137	signal(SIGHUP, die);
138	signal(SIGINT, die);
139	signal(SIGQUIT, die);
140	signal(SIGTERM, die);
141
142	/*
143	 * Initialize display.  Load average appears in a one line
144	 * window of its own.  Current command's display appears in
145	 * an overlapping sub-window of stdscr configured by the display
146	 * routines to minimize update work by curses.
147	 */
148	initscr();
149	CMDLINE = LINES - 1;
150	wnd = (*curcmd->c_open)();
151	if (wnd == NULL) {
152		warnx("couldn't initialize display");
153		die(0);
154	}
155	wload = newwin(1, 0, 1, 20);
156	if (wload == NULL) {
157		warnx("couldn't set up load average window");
158		die(0);
159	}
160	gethostname(hostname, sizeof (hostname));
161	size = sizeof(clkinfo);
162	if (sysctlbyname("kern.clockrate", &clkinfo, &size, NULL, 0)
163	    || size != sizeof(clkinfo)) {
164		error("kern.clockrate");
165		die(0);
166	}
167	hertz = clkinfo.stathz;
168	(*curcmd->c_init)();
169	curcmd->c_flags |= CF_INIT;
170	labels();
171
172	dellave = 0.0;
173
174	display();
175	noecho();
176	crmode();
177	keyboard();
178	/*NOTREACHED*/
179
180	return EXIT_SUCCESS;
181}
182
183void
184labels(void)
185{
186	if (curcmd->c_flags & CF_LOADAV) {
187		mvaddstr(0, 20,
188		    "/0   /1   /2   /3   /4   /5   /6   /7   /8   /9   /10");
189		mvaddstr(1, 5, "Load Average");
190	}
191	(*curcmd->c_label)();
192#ifdef notdef
193	mvprintw(21, 25, "CPU usage on %s", hostname);
194#endif
195	refresh();
196}
197
198void
199display(void)
200{
201	int i, j;
202
203	/* Get the load average over the last minute. */
204	(void) getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0]));
205	(*curcmd->c_fetch)();
206	if (curcmd->c_flags & CF_LOADAV) {
207		j = 5.0*avenrun[0] + 0.5;
208		dellave -= avenrun[0];
209		if (dellave >= 0.0)
210			c = '<';
211		else {
212			c = '>';
213			dellave = -dellave;
214		}
215		if (dellave < 0.1)
216			c = '|';
217		dellave = avenrun[0];
218		wmove(wload, 0, 0); wclrtoeol(wload);
219		for (i = (j > 50) ? 50 : j; i > 0; i--)
220			waddch(wload, c);
221		if (j > 50)
222			wprintw(wload, " %4.1f", avenrun[0]);
223	}
224	(*curcmd->c_refresh)();
225	if (curcmd->c_flags & CF_LOADAV)
226		wrefresh(wload);
227	wrefresh(wnd);
228	move(CMDLINE, col);
229	refresh();
230}
231
232void
233load(void)
234{
235
236	(void) getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0]));
237	mvprintw(CMDLINE, 0, "%4.1f %4.1f %4.1f",
238	    avenrun[0], avenrun[1], avenrun[2]);
239	clrtoeol();
240}
241
242void
243die(int signo __unused)
244{
245	move(CMDLINE, 0);
246	clrtoeol();
247	refresh();
248	endwin();
249	exit(0);
250}
251
252#include <stdarg.h>
253
254void
255error(const char *fmt, ...)
256{
257	va_list ap;
258	char buf[255];
259	int oy, ox;
260
261	va_start(ap, fmt);
262	if (wnd) {
263		getyx(stdscr, oy, ox);
264		(void) vsnprintf(buf, sizeof(buf), fmt, ap);
265		clrtoeol();
266		standout();
267		mvaddstr(CMDLINE, 0, buf);
268		standend();
269		move(oy, ox);
270		refresh();
271	} else {
272		(void) vfprintf(stderr, fmt, ap);
273		fprintf(stderr, "\n");
274	}
275	va_end(ap);
276}
277
278void
279nlisterr(struct nlist n_list[])
280{
281	int i, n;
282
283	n = 0;
284	clear();
285	mvprintw(2, 10, "systat: nlist: can't find following symbols:");
286	for (i = 0;
287	    n_list[i].n_name != NULL && *n_list[i].n_name != '\0'; i++)
288		if (n_list[i].n_value == 0)
289			mvprintw(2 + ++n, 10, "%s", n_list[i].n_name);
290	move(CMDLINE, 0);
291	clrtoeol();
292	refresh();
293	endwin();
294	exit(1);
295}
296